Forty-nine light-years away, a rocky world called LHS 1140 b has offered humanity something it has never held before: evidence that an Earth-like planet beyond our solar system can hold an atmosphere. Astronomers detected helium clinging to this distant world — a gas long assumed too light to survive on such a planet — using a ground-based technique born from fresh theoretical thinking. The discovery does not yet confirm life, but it quietly reshapes the boundary of where life might be possible, and reminds us that the oldest human question is still being asked with new tools.